From Linux to Windows - problem

Hi. I wrote some code like this:

Code:

---

FILE * plik;


plik = fopen("plik.in", "r");
fscanf(plik, "(%d,%d),(%d,%d),(%d,%d),(%d,%d)", &ax,&ay,&bx,&by,&cx,&cy,&dx,&dy);
fclose(plik);

---

and plik.in looks like that:
(0,0),(2,0),(3,3),(0,2)

On the Linux platform everything is ok, but the same on windows doesn't work. Have anyone any idea why?

Can you show your whole code? What errors are you getting?

There are no errors. I can compile the code but after this, program simply doesn't work. Function fscanf loads strange values.

Code:

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#include <stdio.h>
#include <math.h>


//po podaniu współrzednch punktu funkcja oblicza długość odcinka
double oblicz_dlugosc_boku(int wspolrzedna_x, int wspolrzedna_y, int wspolrzedna_x2, int wspolrzedna_y2)
{
        //zastosowanie twierdzenia pitagorasa do obliczania dĹ‚ugoĹ›ci bokĂłw
        double dlugosc_boku = sqrt(((wspolrzedna_x - wspolrzedna_x2)*(wspolrzedna_x - wspolrzedna_x2)) + ((wspolrzedna_y - wspolrzedna_y2)*(wspolrzedna_y - wspolrzedna_y2)));
        return dlugosc_boku;
}


double oblicz_pole(double a, double b, double c)
{
        //obliczanie obwodu
        double p = (a+b+c)/2;
        //wykorzystanie wzoru Herona do obliczenia pola trĂłjkÄ…ta i zaokrÄ…glenie wyniku do 4 miejsca po przecinku
        double pole = round(10000 * sqrt(p*(p-a)*(p-b)*(p-c)))/10000;
        return pole;
}


int main ()
{
system("chcp 1250");


int ax,ay,bx,by,cx,cy,dx,dy;
double AC,BD,AB,BC,AD,CD,pABC,pACD,pABD,pBCD;


FILE * plik;


plik = fopen("czworokat.in", "r");
//wczytywanie kolejnych współrzednych
fscanf(plik, "(%d,%d),(%d,%d),(%d,%d),(%d,%d)", &ax,&ay,&bx,&by,&cx,&cy,&dx,&dy);
///////////////////////////////////////
printf("%d,%d,%d,%d,%d,%d,%d,%d\n", ax,ay,bx,by,cx,cy,dx,dy);// look at this values, thats what im talking about
//////////////////////////////////////
//zamknięcie strumienia
fclose(plik);


//OBLICZANIE D�UGOŚĆI PRZEKĄTNYCH AC,BD
AC = oblicz_dlugosc_boku(ax,ay,cx,cy);
BD = oblicz_dlugosc_boku(dx,dy,bx,by);
//OBLICZANIE D�UGOŚCI BOKÓW AB,BC,CD,AD
AB = oblicz_dlugosc_boku(ax,ay,bx,by);
BC = oblicz_dlugosc_boku(bx,by,cx,cy);
CD = oblicz_dlugosc_boku(cx,cy,dx,dy);
AD = oblicz_dlugosc_boku(ax,ay,dx,dy);
//OBLICZANIE PĂ“L TRĂ“JKÄ„TĂ“W
pABC = oblicz_pole(AB, BC, AC);
pACD = oblicz_pole(AC, CD, AD);
pABD = oblicz_pole(AB, BD, AD);
pBCD = oblicz_pole(BC, CD, BD);


//SPRAWDZANIE CZY POLA SUMY PĂ“L TRĂ“JKÄ„TĂ“W SÄ„ RĂ“WNE
if((pABC + pACD) == (pABD + pBCD))
{
        printf("TAK! Ten czworokÄ…t jest wypukĹ‚y!\n");
}
else
{
        printf("NIE! To nie jest czworokÄ…t wypukĹ‚y!\n %d", ax);
}
int i;
scanf("%d", &i);
return 0;
}

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What does this do "system("chcp 1250");"?
Is there any reason to believe it does the same thing in Windows?

Edit: From this site, it appears to be a valid Windows command; but, not sure it does what is needed.
windows XP command line encoding - Super User

Tim S.

Command system("chcp 1250") is for Polish chars in console. I added it on Windows, but it didnt make any difference.

Any thoughts what is with this miserable fscanf? ;<

I suggest checking the return value of fopen to see if it failed.
Then, checking the return value of fscanf.

Tim S.

You should check to see if fopen did not return NULL before using you open file.

Maybe it might be worth using fgets with sscanf, so that you can see what is happening.

I might also have something to do with the format that your text document is in - Someone might be able to fill in whether you need wide char functions

Already done that for fscanf. Result is pretty interesting. In place of ints from (0,0),(2,0),(3,3),(0,2) I have Attachment 12665 in 2nd line is false result from if.

How to check return value of fopen ?

if (plik == NULL) -> Failed.

With file is everything ok. For me fscanf is curious, i dont get the result it gives.

What is the output of

Code:

---

int n = fscanf(plik, "(%d,%d),(%d,%d),(%d,%d),(%d,%d)", &ax,&ay,&bx,&by,&cx,&cy,&dx,&dy);
printf("items read: %d\n", n);

---

What is the output of (immediately after opening the file)

Code:

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int ch;
while ((ch = getc(plik)) != EOF)
    printf("%c - %d - %x\n", ch, ch, ch);

---

Bye, Andreas